Maintenance Instructions
Suspension (Air and Steel Springs)
CAUTION
To prevent property damage, do not adjust air
suspension height to any setting other than the
specified setting.
Altering the height setting
will change the driveline angle and may result
in unwarrantable component damage, such as
transmission component damage.
Verify drive axle air suspension height at engine oil change
intervals. See the appropriate Service Manual.
NOTE: Suspension alignment must be maintained at all
times.
NOTE: Refer to SECTION 8 — MAINTENANCE INTERVALS
AND SPECIFICATIONS for proper U-bolt torque values.
Periodically:
•
Check condition of spring leaves for evidence of fatigue,
bending or breakage.
•
Check condition of suspension mounting brackets and
bushings.
•
Check that suspension mounts (such as brackets,
bushings, and fasteners) are tight.
•
Check that torque rod mounting fasteners are tight.
•
Check U-bolts as follows:
1.
After the chassis has been operating under
load for 1,000 miles (1,600 km) or six months,
whichever comes first, the U-bolt nuts must be
re-torqued.
2.
Thereafter, the U-bolt nuts must be re-torqued
every 36,000 miles (58,000 km).
Re-torque
interval may be lowered to 25,000 miles (46,000
km) to synchronize with oil change interval.
Front Suspension
The front suspension should be regularly inspected for loose,
worn, or broken components.
Front suspensions / axles
should be checked periodically for proper alignment to promote
maximum tire life.
On vehicles equipped with the optional front air suspension, the
air suspension components, including air bags, height control
valves, air lines, and fittings should be inspected for wear,
damage, and audible air leaks.
Rear Suspension
The rear suspension should be regularly inspected for loose,
worn, or broken components.
Rear suspensions / axles
should be checked periodically for proper alignment to promote
maximum tire life.
The optional International
®
Truck Ride
Optimized Suspension (IROS) components, including air bags,
height control valves, air lines, and fittings should be inspected
for wear, damage, and audible air leaks.
233
Summary of Contents for ProStar+
Page 4: ......
Page 24: ...Foreword 12...
Page 38: ...Model Description 26...
Page 74: ...Controls Features Declination Zone Map 62...
Page 98: ...Controls Features Center Dash Panel Wing Panel 86...
Page 118: ...Controls Features 106...
Page 243: ...Maintenance Instructions 231...
Page 286: ...Maintenance Intervals and Specifications 274...
